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A boy throws a ball vertically upward with a velocity of 6 meters per second. How long does it take the ball to return to the boy's hand?
Ans:
A boy throws a ball vertically upward with a velocity of 6 meters per second. It takes the ball to return to the boy's hand around 1.22 seconds accepts 1.2 seconds.
A 415V 3-phase a.c. motor has a power output of 12.75kW and operates at a power factor of 0.77 lagging and with an ef?ciency of 85%. If the motor is delta-connected, verify
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